I find this a very interesting discussion. My husband and most of the other men we have played with have been of average size, 5" to 6" give or take. This last weekend we played with a single male friend that tops out at the 9" range. I had no problem taking him, but the next day my jaw was so sore I could barely open my mouth. Anyway, it really turn my husband on to see me deep throat a penis that large. I didn't think I could do it, but I did
I know this subject is more about vaginal fucking. Size isn't that important to me, I like them all. However, I perfer the average. Not for the way it fills me, but it helps to get my clit hitting their stomach or balls. That's more of a turn on for me. The bigger ones I don't get the clit stimlation
As far as women sizes, my husband has commented that most the women we've met feels like he's throwing the weanie down the hall or fucking slush. Me, I do my kegals...daily....a couple dozen times a day. Hubby says he can feel me squeezing his cock when it's inside and that I get a tight grib on things. It's a challenge for me to be tight around any size of dick that comes my way.